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Amelioration of phytotoxic effects of Cd on mung bean seedlings by gluconic acid secreting rhizobacterium <Emphasis Type="Italic">Enterobacter asburiae</Emphasis> PSI3 and implication of role of organic acid
Authors:B Kavita  Sapna Shukla  G Naresh Kumar  G Archana
Institution:(1) Department of Microbiology and Biotechnology Center, Faculty of Science, Maharaja Sayajirao University of Baroda, Vadodara, 390002, Gujarat, India;(2) Department of Biochemistry, Faculty of Science, Maharaja Sayajirao University of Baroda, Vadodara, 390002, Gujarat, India
Abstract:Mung bean seedlings inoculated with Enterobacter asburiae PSI3, a gluconic acid-producing rhizosphere isolate, enhanced plant growth in the presence of phytotoxic levels of Cd2+ in gnotobiotic pot experiments as compared to the uninoculated Cd-treated plants. Addition of organic acids to Cd-stressed seedlings promoted root elongation. Hematoxylin competition assays showed that organic acids could displace Cd2+ from the Cd2+: hematoxylin complex in the same order of effectiveness as was found for restoration of root net elongation viz. oxalate > malate > succinate while gluconate was effective at higher concentrations. Root associated Cd2+, assessed by hematoxylin staining of roots was found to be reduced when roots were treated with organic acid. Cd stress increased antioxidant enzymes such as peroxidase and superoxide dismutase in mung bean roots while organic acid treatment suppressed the up-regulation of these enzymes by Cd.
Keywords:Enterobacter asburiae PSI3  Cadmium toxicity  Organic acids  Mung bean  Catalase  Peroxidase
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